devcontainer for ruby2 and hanami setup

devcontainer.json

{
	"name": "app",
	"dockerComposeFile": "docker-compose.yml",
	"service": "api",
	"workspaceFolder": "/workspace",
	"settings": {
		"terminal.integrated.shell.linux": "/bin/bash",
		"solargraph.commandPath": "/usr/local/bundle/bin/solargraph"
	},
	"extensions": [
		"rebornix.Ruby",
		"castwide.solargraph"
	]
}

docker-compose.yml

version: "3"
services:
  api:
    build:
      context: ..
      dockerfile: .devcontainer/Dockerfile
    volumes:
      - ..:/workspace
      - ../vendor:/vendor
    environment:
      DATABASE_URL: postgresql://app@db:5432/app_development
      SERVE_STATIC_ASSETS: "true"
      API_SESSIONS_SECRET: XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

    command: bash /workspace/.devcontainer/entrypoint.sh
    ports:
      - 2300:2300
    links:
      - db

  db:
    image: postgres:10.9-alpine
    environment:
      POSTGRES_USER: app

Dockerfile

FROM ruby:2.6.4

ENV LANG=C.UTF-8 \
  LC_ALL=C.UTF-8

ENV BUNDLE_JOBS=4 \
  BUNDLE_PATH=/vendor/bundle

RUN apt-get update \
  && apt-get install -y git iproute2 procps postgresql \
  && gem install ruby-debug-ide solargraph debase \
  && gem install bundler hanami \
  && apt-get autoremove -y \
  && apt-get clean -y \
  && rm -rf /var/lib/apt/lists/*

WORKDIR /workspace

entrypoint.sh

#!/usr/bin/env bash

if [ -e Gemfile ]; then
  bundle check || bundle install
fi

if [ -e rackup.pid ]; then
  rm rackup.pid
fi

if [ -n "$DATABASE_HOST" ]; then
  until echo < /dev/tcp/$DATABASE_HOST/5432; do
    sleep 1
  done
fi

bundle exec hanami server --host=0.0.0.0